1. University of Essen; Institute for Medical Informatics, Biometry and Epidemiology (IMIBE); 45122 Essen Hufelandstraße 55 Germany
2. RWTH Aachen University, Faculty of Medicine; Institute for Occupational and Social Medicine; 52074 Aachen Pauwelsstraße 30 Germany
3. Friedrich-Alexander University Erlangen-Nürnberg (FAU); Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine; 91054 Erlangen Schillerstraße 25 and 29 Germany
4. Institute for Applied Biosciences; Karlsruhe Institute of Technology (KIT); Department of Food Chemistry and Toxicology; 76131 Karlsruhe Adenauerring 20a, Geb. 50.41 Germany